1.

The compound (A) is a white solid. When heated strongly, it leaves no residue. On treating (A) with NaOH solution, a colourless pungent smelling gas (B) is evolved which is industrially highly useful. When the compound (A) is acidified with dilute HCl, a reddish brown gas (C ) is evolved. The compound (A) is :

Answer»

ammonium nitrite
ammonium chloride
sodium nitrite
sodium nitrate.

Solution :The compound (A) is ammonium nitrite as is suggested from the AVAILABLE information. It decomposes as :
`underset((A)) (NH_(4)NO_(2)) overset("heat")to underset(("no residue")(N_(2)+2H_(2)O)`


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